CN110835252A - Steel fiber reinforced self-compacting concrete hexagonal precast block and preparation method thereof - Google Patents
Steel fiber reinforced self-compacting concrete hexagonal precast block and preparation method thereof Download PDFInfo
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- CN110835252A CN110835252A CN201911288865.1A CN201911288865A CN110835252A CN 110835252 A CN110835252 A CN 110835252A CN 201911288865 A CN201911288865 A CN 201911288865A CN 110835252 A CN110835252 A CN 110835252A
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- steel fiber
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- precast block
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses a steel fiber reinforced self-compacting concrete hexagonal precast block and a preparation method thereof in the field of concrete. The defects that the hexagonal precast block prepared by the existing common concrete needs to be vibrated and is easy to break are effectively overcome.
Description
Technical Field
The invention relates to concrete, in particular to a steel fiber reinforced self-compacting concrete hexagonal precast block and a preparation method thereof.
Background
In slope protection engineering, especially hydraulic engineering's bank protection to and road surface lay and often can adopt the hexagonal prefabricated section, traditional hexagonal prefabricated section need vibrate and break often appear in the use in the manufacture process, if can adopt self-compaction concrete and add reinforcing fiber in hexagonal prefabricated section manufacture process and will solve above-mentioned problem.
The steel fiber reinforced self-compacting concrete hexagonal precast block has the advantages of no need of vibration in the manufacturing process, wide raw material sources, convenience in construction and the like, and the slope or the road surface paved by the steel fiber reinforced self-compacting concrete hexagonal precast block has good mechanical property.
The steel fiber reinforced self-compacting concrete precast block has the shape that the front surface is a regular hexagon, the side length is 20mm, and the thickness is 10-15 mm. The shape and size of the device can be adjusted according to the needs. Because this prefabricated section geometry rule, alignment that can be good in the laying process, slope protection is domatic or road surface can obtain neatly level and smooth laying, construction convenience, has added steel fibre and can also solve the easy cracked defect of traditional hexagonal piece effectively.
Disclosure of Invention
The invention aims to provide a steel fiber reinforced self-compacting concrete hexagonal precast block, which is characterized in that a steel fiber reinforced material is added into self-compacting concrete under the condition of ensuring the working performance of a mixture, so that the defect that the hexagonal precast block needs to be vibrated in the manufacturing process is overcome, the mechanical property of the concrete hexagonal precast block can be improved, and the phenomenon that the precast block is broken in the laying and using processes is effectively prevented.
The purpose of the invention is realized as follows:
a preparation method of a steel fiber reinforced self-compacting concrete hexagonal precast block comprises the following steps:
step 1, preparing concrete mixed raw materials and steel fibers according to the following proportion of unit volume usage:
360-400 kg/m cement3(ii) a 800-900 kg/m stone3(ii) a 750-800 kg/m sand3(ii) a 140-200 kg/m of fly ash3(ii) a 5-6 kg/m of polycarboxylic acid high-efficiency water reducing agent3(ii) a 180-220 kg/m water3(ii) a 2.5-3 kg/m defoaming agent3(ii) a The volume ratio of the addition amount of the steel fibers to the concrete mixed components is 0.5-0.9%.
Step 2, pre-stirring the sand, the broken stone, the cement and the fly ash, putting the weighed dry materials of each component into a stirrer, uniformly stirring, adding a water reducing agent and a defoaming agent into water in advance, uniformly diluting, adding into the stirrer, and stirring together with the dry materials to obtain a concrete mixture;
step 3, pressing and forming, namely pouring the obtained mixture into a mould, properly inserting and tamping for pressing and forming, and demoulding after forming to obtain the steel fiber reinforced self-compacting concrete hexagonal precast block;
and 4, curing, namely regularly sprinkling water to the prepared steel fiber reinforced self-compacting concrete hexagonal precast block semi-finished product within a curing period, wherein the time is generally 7d, so that the concrete has proper curing conditions to prevent dry cracking in the concrete hardening process.
As a further limitation of the invention, in the step 4, the curing condition temperature is 12-25 ℃, the relative humidity is more than 96%, and the curing time is more than 28 days.
As a further limitation of the invention, the cement is ordinary portland cement with the strength grade of 42.5 MPa; the stones are broken stones, and the nominal grain size is 5-20 mm; the sand is medium sand with good gradation; the fiber is copper-plated micro-wire steel fiber; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
The steel fiber reinforced self-compacting concrete hexagonal precast block is prepared by the method, and the front surface of the steel fiber reinforced self-compacting concrete hexagonal precast block is in a regular hexagon shape.
The steel fiber reinforced self-compacting concrete hexagonal precast block and the preparation method thereof have the advantages that:
(1) the working performance is good: the self-compacting concrete material mixture has good fluidity, does not need vibration in the forming process, can be automatically filled and compacted under the action of self gravity, and reduces the noise generated in the manufacturing process.
(2) The fracture resistance is improved: the steel fiber is added, and the three-dimensional constraint provided by the fiber increases the concrete strength, improves the brittleness of the concrete material, and plays a role in enhancing and toughening the steel fiber material.
(3) The compactness is improved: the defoaming agent is added, so that the compactness of the self-compacting concrete can be effectively improved, the internal pore structure of the concrete is improved, and the content porosity of the concrete is reduced.
Detailed Description
The technical solution of the present invention is further specifically described below by examples, but the examples are not intended to limit the present invention, and all similar modifications of the present invention should be included in the scope of the present invention.
Example one
The invention relates to a steel fiber reinforced self-compacting concrete hexagonal precast block and a preparation method thereof, wherein the method comprises the following steps:
step 1, selecting continuous graded broken stones with nominal particle size of 5-20 mm as coarse aggregate, and selecting medium sand with good grading as fine aggregate;
step 2, simultaneously adding 5.12kg of polycarboxylic acid high-efficiency water reducing agent and 2.61kg of defoaming agent into 205.4kg of water (the mass ratio is 2.49%:1.27%: 1) and uniformly stirring for later use;
step 3, putting 779.6kg of medium sand and 818.6kg of broken stone (the mass ratio is 1: 1.05) into a stirrer to be uniformly stirred;
step 4, adding 39.1kg of steel fiber (according to the volume ratio of the steel fiber to the concrete being 0.5%: 1) into the uniformly stirred mixture of the macadam and the medium sand, and continuously stirring for 80 seconds to uniformly disperse the mixture;
step 5, 385.5kg of ordinary portland cement and 185.1kg of fly ash are put into a stirrer to be stirred for 60s so that the mixture of different materials is uniform;
step 6, adding the water (the water-to-gel ratio is 0.36) mixed with the additive in the step 2 into the mixture stirred in the step 5, stirring for 120s, and discharging;
step 7, pressing and forming, namely pouring the obtained mixture into a mould, properly inserting and tamping for pressing and forming, and demoulding after forming to obtain the steel fiber reinforced self-compacting concrete hexagonal precast block;
and 8, curing, namely regularly sprinkling water to the prepared steel fiber reinforced self-compacting concrete hexagonal precast block semi-finished product within a curing period, wherein the time is generally 7d, so that the concrete has proper curing conditions to prevent dry cracking in the concrete hardening process. The curing condition temperature is 12-25 ℃, the relative humidity is more than 96%, and the curing time is more than 28 days.
Example two
The invention relates to a steel fiber reinforced self-compacting concrete hexagonal precast block and a preparation method thereof, wherein the method comprises the following steps:
step 1, selecting continuous graded broken stones with nominal particle size of 5-20 mm as coarse aggregate, and selecting medium sand with good grading as fine aggregate;
step 2, simultaneously adding 5.53kg of polycarboxylic acid high-efficiency water reducing agent and 2.73kg of defoaming agent into 205.4kg of water (the mass ratio is 2.69%:1.32%: 1) and uniformly stirring for later use;
step 3, putting 779.6kg of medium sand and 818.6kg of broken stone (the mass ratio is 1: 1.05) into a stirrer to be uniformly stirred;
step 4, adding 54.6kg of steel fiber (according to the volume ratio of the steel fiber to the concrete being 0.7%: 1) into the uniformly stirred mixture of the macadam and the medium sand, and continuously stirring for 80 seconds to uniformly disperse the mixture;
step 5, 385.5kg of ordinary portland cement and 185.1kg of fly ash are put into a stirrer to be stirred for 60s so that the mixture of different materials is uniform;
step 6, adding the water (the water-to-gel ratio is 0.36) mixed with the additive in the step 2 into the mixture stirred in the step 5, stirring for 120s, and discharging;
step 7, pressing and forming, namely pouring the obtained mixture into a mould, properly inserting and tamping for pressing and forming, and demoulding after forming to obtain the steel fiber reinforced self-compacting concrete hexagonal precast block;
and 8, curing, namely regularly sprinkling water to the prepared steel fiber reinforced self-compacting concrete hexagonal precast block semi-finished product within a curing period, wherein the time is generally 7d, so that the concrete has proper curing conditions to prevent dry cracking in the concrete hardening process. The curing condition temperature is 12-25 ℃, the relative humidity is more than 96%, and the curing time is more than 28 days.
EXAMPLE III
The invention relates to a steel fiber reinforced self-compacting concrete hexagonal precast block and a preparation method thereof, wherein the method comprises the following steps:
step 1, selecting continuous graded broken stones with nominal particle size of 5-20 mm as coarse aggregate, and selecting medium sand with good grading as fine aggregate;
step 2, simultaneously doping 5.89kg of polycarboxylic acid high-efficiency water reducing agent and 2.95kg of defoaming agent into 205.4kg of water (the mass ratio is 2.87%:1.43%: 1) and uniformly stirring for later use;
step 3, putting 779.6kg of medium sand and 818.6kg of broken stone (the mass ratio is 1: 1.05) into a stirrer to be uniformly stirred;
step 4, adding 6kg of steel fiber (according to the volume ratio of the steel fiber to the concrete being 0.9%: 1) into the uniformly stirred mixture of the macadam and the medium sand, and continuously stirring for 80 seconds to uniformly disperse the mixture;
step 5, 385.5kg of ordinary portland cement and 185.1kg of fly ash are put into a stirrer to be stirred for 60s so that the mixture of different materials is uniform;
step 6, adding the water (the water-to-gel ratio is 0.36) mixed with the additive in the step 2 into the mixture stirred in the step 5, stirring for 120s, and discharging;
step 7, pressing and forming, namely pouring the obtained mixture into a mould, properly inserting and tamping for pressing and forming, and demoulding after forming to obtain the steel fiber reinforced self-compacting concrete hexagonal precast block;
and 8, curing, namely regularly sprinkling water to the prepared steel fiber reinforced self-compacting concrete hexagonal precast block semi-finished product within a curing period, wherein the time is generally 7d, so that the concrete has proper curing conditions to prevent dry cracking in the concrete hardening process. The curing condition temperature is 12-25 ℃, the relative humidity is more than 96%, and the curing time is more than 28 days.
The following table is a comparison table of performance tests of the steel fiber reinforced self-compacting concrete material prepared by the above three examples.
| Examples | Slump spread (mm) | Extension time T500（s） | Compressive strength（Mpa） |
| A | 625 | 3 | 48.4 |
| II | 610 | 3 | 51.5 |
| III | 595 | 2 | 54.7 |
With the increase of the volume of the steel fibers, the working performance of the self-compacting concrete is reduced due to the cross-lapping and partial agglomeration of the fibers, and even the technical requirements of the self-compacting concrete cannot be met, at this time, the dosage of each material can be tried out, adjusted and determined according to JGJ/T283 and 2012 'technical specification for application of self-compacting concrete', so as to meet the working performance of the self-compacting concrete.
Claims (4)
1. The preparation method of the steel fiber reinforced self-compacting concrete hexagonal precast block is characterized by comprising the following steps of:
step 1, preparing concrete mixed raw materials and steel fibers according to the following proportion of unit volume usage:
360-400 kg/m cement3(ii) a 800-900 kg/m stone3(ii) a 750-800 kg/m sand3(ii) a 140-200 kg/m of fly ash3(ii) a 5-6 kg/m of polycarboxylic acid high-efficiency water reducing agent3(ii) a 180-220 kg/m water3(ii) a 2.5-3 kg/m defoaming agent3(ii) a The volume ratio of the addition amount of the steel fibers to the concrete mixed component is 0.5-0.9%;
step 2, pre-stirring the sand, the broken stone, the cement and the fly ash, putting the weighed dry materials of each component into a stirrer, uniformly stirring, adding a water reducing agent and a defoaming agent into water in advance, uniformly diluting, adding into the stirrer, and stirring together with the dry materials to obtain a concrete mixture;
step 3, pressing and forming, namely pouring the obtained mixture into a mould, properly inserting and tamping for pressing and forming, and demoulding after forming to obtain the steel fiber reinforced self-compacting concrete hexagonal precast block;
and 4, curing, namely regularly sprinkling water to the prepared steel fiber reinforced self-compacting concrete hexagonal precast block semi-finished product within a curing period, wherein the time is generally 7d, so that the concrete has proper curing conditions to prevent dry cracking in the concrete hardening process.
2. The method for preparing the steel fiber reinforced self-compacting concrete hexagonal precast block according to claim 1, wherein the curing condition in step 4 is 12-25 ℃, the relative humidity is more than 96%, and the curing time is more than 28 days.
3. The method for preparing the steel fiber reinforced self-compacting concrete hexagonal precast block according to claim 1, wherein the cement in step 1 is ordinary portland cement with a strength grade of 42.5 MPa; the stones are broken stones, and the nominal grain size is 5-20 mm; the sand is medium sand with good gradation; the steel fiber is copper-plated micro-wire steel fiber; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
4. A steel fiber reinforced self-compacting concrete hexagonal precast block prepared by the preparation method of any one of the above claims 1 to 3, wherein the front surface of the outer shape is a regular hexagon.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805160A (en) * | 2010-04-21 | 2010-08-18 | 中南大学 | Self-compacting concrete |
| CN107032695A (en) * | 2017-03-20 | 2017-08-11 | 张家港江苏科技大学产业技术研究院 | Steel Fiber Reinforced Self-compacting Concrete and preparation method thereof, prefabricated components |
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- 2019-12-16 CN CN201911288865.1A patent/CN110835252A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805160A (en) * | 2010-04-21 | 2010-08-18 | 中南大学 | Self-compacting concrete |
| CN107032695A (en) * | 2017-03-20 | 2017-08-11 | 张家港江苏科技大学产业技术研究院 | Steel Fiber Reinforced Self-compacting Concrete and preparation method thereof, prefabricated components |
Non-Patent Citations (5)
| Title |
|---|
| 《水利水电工程施工实用手册》编委会编: "《混凝土工程施工》", 31 December 2017, 中国环境科学出版社 * |
| 刘书程等: "生态护坡预制构件自密实混凝土工作性能与浇筑工艺研究", 《混凝土》 * |
| 杨伯科: "《混凝土实用新技术手册 （精编）》", 31 January 1998, 吉林科学技术出版社 * |
| 罗素蓉等: "纤维自密实混凝土力学性能及早期抗裂性能研究", 《广西大学学报:自然科学版》 * |
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Application publication date: 20200225 |